Construction of containers or tanks

A container having a peripheral wall constructed from at least one row of interconnectible structural members wherein each of said structural members is of substantially rectangular shape and comprises a panel portion having a shape in cross-section of a circular arc and including a flange extending along the top, bottom and side edges thereof, the top and bottom flanges having the same circular arc shape as said panel and the side flanges each providing two planar faces at an angle to one another, one of said planar faces of each side flange, when viewed in cross-section, extending substantially perpendicular to the chord defined by the end points of the circular arc, the side flanges of adjacent structural members being interconnected in end-to-end relationship in a row to provide a said peripheral wall and at least two of said structural members being arranged in end-to-end relationship so that the said one planar face of one side flange of one structural member abuts with the said one planar face of one side flange of the other structural member so as to produce a scalloped configuration in cross-section.